I found Andrew Wilson in the Alleghany, Virginia Sheet 98
Page 98A Line 11 1840 Census.
Males 1 10-15 and 1 30-49
Females 2 0-5 and 1 20-30
The ages correspond with the family. Sarah was 5 Rufina 2
James M 11. Andrew abt 44 and Nancy 38. The district is the Western which is the same district as the 1850 district